external radiation dose was approximately 170 - 600 rad for 14 days,
about half or more being irradiated on the first day.
The dose to
each person differed depending on his behavior on the boat and the
position of his cabin.
The integrated dose to thyroid glands from 131, was inferred as
about 20-120rad.
Urine samples which were collected at 4 weeks after
the explosion revealed significant amount of radioactivity.
However,
the radioactivity decreased rapidly, e.g. at about 6 months post
detonation the activity was barely detectable.
In the analysis after
8 1/2 years and 10 years the levels of 13765 and
the same to those of normal Japanese.
9
Os: in urine were
At the same time the results
of whole body counting showed no significant difference between
fishermen and controls.
The radioactivity in several ergans of the
fatal case was Righer than controls, but low.
—
_
B. Clinical and Laboratory.Findings =
1.
General symptoms andsigns
Soon after the initial exposure most of the fishermen experienced
anorexia, fatigue, and lachrymationy and in some of them nausea and
a
vomiting occurred.
2.
.
Skin lesions
tow:“4
wee!
et
ay
Skin lesions were caused by beta irradiation.
Shortly after the
exposure, they suffered from erythema which was followed by edema,
vesicle, erosion, ulceration or necrosis.
in 20 cases, especially
2 cases who did not wear hats during ash-fall
revealed complete epilation.
These skin lesions were similar to
ordinary radiodermatitis histologically.
gradually.
Epilations were observed
The skin injries recovered
At present, namely 20 years after the exposure, ina few
cases depigmentation, pigmentation and capillary dilatation are observed.
Atrophy of epidermis with narrowed stratum granulosum were clear ©
in histological section of these area examined 10 years after the exposure.
3.
a.
Hematology
Leukocytes :
Total number of leukocytes decreased gradually,